/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.metadata.schemaregion.rocksdb;

import org.apache.iotdb.commons.conf.IoTDBConstant;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.rocksdb.util.SizeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Properties;

public class RSchemaConfLoader {

    private int maxBackgroundJobs = 10;
    private int blockSizeDeviation = 5;
    private int blockRestartInterval = 10;
    private int maxWriteBufferNumber = 6;

    private double bloomFilterPolicy = 64;

    private long blockSize = 4 * SizeUnit.KB;
    private long writeBufferSize = 64 * SizeUnit.KB;
    private long maxTotalWalSize = 64 * SizeUnit.KB;
    private long blockCache =
            IoTDBDescriptor.getInstance().getConfig().getAllocateMemoryForSchemaRegion() * 2 / 3;
    private long blockCacheCompressed =
            IoTDBDescriptor.getInstance().getConfig().getAllocateMemoryForSchemaRegion() / 3;

    private static final String ROCKSDB_CONFIG_FILE_NAME = "schema-rocksdb.properties";
    private static final Logger logger = LoggerFactory.getLogger(RSchemaConfLoader.class);

    public RSchemaConfLoader() {
        loadProperties();
    }

    private void loadProperties() {
        String iotdbHomePath = System.getProperty(IoTDBConstant.IOTDB_HOME, null);
        String rocksdbConfigPath =
                iotdbHomePath + File.separatorChar + "conf" + File.separatorChar + ROCKSDB_CONFIG_FILE_NAME;
        try (InputStream in = new BufferedInputStream(new FileInputStream(rocksdbConfigPath))) {
            Properties properties = new Properties();
            properties.load(in);
            setBlockCache(
                    Long.parseLong(properties.getProperty("block_cache_size", Long.toString(blockCache))));
            setBlockCacheCompressed(
                    Long.parseLong(
                            properties.getProperty(
                                    "block_cache_compressed_size", Long.toString(blockCacheCompressed))));
            setBlockSize(Long.parseLong(properties.getProperty("block_size", Long.toString(blockSize))));
            setWriteBufferSize(
                    Long.parseLong(
                            properties.getProperty("write_buffer_size", Long.toString(writeBufferSize))));
            setMaxTotalWalSize(
                    Long.parseLong(
                            properties.getProperty("max_total_wal_size", Long.toString(maxTotalWalSize))));
            setMaxBackgroundJobs(
                    Integer.parseInt(
                            properties.getProperty(
                                    "max_background_job_num", Integer.toString(maxBackgroundJobs))));
            setBlockSizeDeviation(
                    Integer.parseInt(
                            properties.getProperty(
                                    "block_size_deviation", Integer.toString(blockSizeDeviation))));
            setBlockRestartInterval(
                    Integer.parseInt(
                            properties.getProperty(
                                    "block_restart_interval", Integer.toString(blockRestartInterval))));
            setMaxWriteBufferNumber(
                    Integer.parseInt(
                            properties.getProperty(
                                    "max_write_buffer_num", Integer.toString(maxWriteBufferNumber))));
            setBloomFilterPolicy(
                    Double.parseDouble(
                            properties.getProperty("bloom_filter_policy", Double.toString(bloomFilterPolicy))));
        } catch (FileNotFoundException e) {
            logger.warn("Fail to find rocksdb config file {}", rocksdbConfigPath, e);
        } catch (IOException e) {
            logger.warn("Cannot load rocksdb config file, use default configuration", e);
        }
    }

    public long getBlockCache() {
        return blockCache;
    }

    private void setBlockCache(long blockCache) {
        this.blockCache = blockCache;
    }

    public long getBlockCacheCompressed() {
        return blockCacheCompressed;
    }

    private void setBlockCacheCompressed(long blockCacheCompressed) {
        this.blockCacheCompressed = blockCacheCompressed;
    }

    public long getWriteBufferSize() {
        return writeBufferSize;
    }

    private void setWriteBufferSize(long writeBufferSize) {
        this.writeBufferSize = writeBufferSize;
    }

    public long getMaxTotalWalSize() {
        return maxTotalWalSize;
    }

    private void setMaxTotalWalSize(long maxTotalWalSize) {
        this.maxTotalWalSize = maxTotalWalSize;
    }

    public int getMaxBackgroundJobs() {
        return maxBackgroundJobs;
    }

    private void setMaxBackgroundJobs(int maxBackgroundJobs) {
        this.maxBackgroundJobs = maxBackgroundJobs;
    }

    public double getBloomFilterPolicy() {
        return bloomFilterPolicy;
    }

    private void setBloomFilterPolicy(double bloomFilterPolicy) {
        this.bloomFilterPolicy = bloomFilterPolicy;
    }

    public int getBlockSizeDeviation() {
        return blockSizeDeviation;
    }

    private void setBlockSizeDeviation(int blockSizeDeviation) {
        this.blockSizeDeviation = blockSizeDeviation;
    }

    public int getBlockRestartInterval() {
        return blockRestartInterval;
    }

    private void setBlockRestartInterval(int blockRestartInterval) {
        this.blockRestartInterval = blockRestartInterval;
    }

    public int getMaxWriteBufferNumber() {
        return maxWriteBufferNumber;
    }

    private void setMaxWriteBufferNumber(int maxWriteBufferNumber) {
        this.maxWriteBufferNumber = maxWriteBufferNumber;
    }

    public long getBlockSize() {
        return blockSize;
    }

    private void setBlockSize(long blockSize) {
        this.blockSize = blockSize;
    }
}
